/*
 * Copyright (C) 2008-2011 Big Muscle, http://strongdc.sf.net
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#ifndef _INDEXMANAGER_H
#define _INDEXMANAGER_H

#include "Constants.h"
#include "KBucket.h"

#include "../client/ShareManager.h"
#include "../client/Singleton.h"

#include <atomic>

namespace dht
{

struct File
{
	File() { };
	File(const TTHValue& _tth, int64_t _size, bool _partial) :
		tth(_tth), size(_size), partial(_partial) { }
		
	/** File hash */
	TTHValue tth;
	
	/** File size in bytes */
	int64_t size;
	
	/** Is it partially downloaded file? */
	bool partial;
};

struct Source
{
	GETSET(CID, cid, CID);
	GETSET(string, ip, Ip);
	GETSET(uint64_t, expires, Expires);
	GETSET(uint64_t, size, Size);
	GETSET(uint16_t, udpPort, UdpPort);
	GETSET(bool, partial, Partial);
};

class IndexManager :
	public Singleton<IndexManager>
{
	public:
		IndexManager(void);
		~IndexManager(void);
		
		typedef std::deque<Source> SourceList;
		
		/** Finds TTH in known indexes and returns it */
		bool findResult(const TTHValue& tth, SourceList& sources) const;
		
		/** Try to publish next file in queue */
		void publishNextFile();
		
		/** Loads existing indexes from disk */
		void loadIndexes(SimpleXML& xml);
		
		/** Save all indexes to disk */
		void saveIndexes(SimpleXML& xml);
		
		/** How many files is currently being published */
		void incPublishing()
		{
			++publishing;
		}
		void decPublishing()
		{
			--publishing;
		}
		
		/** Is publishing allowed? */
		void setPublish(bool _publish)
		{
			publish = _publish;
		}
		bool getPublish() const
		{
			return publish;
		}
		
		/** Processes incoming request to publish file */
		void processPublishSourceRequest(const Node::Ptr& node, const AdcCommand& cmd);
		
		/** Removes old sources */
		void checkExpiration(uint64_t aTick);
		
		/** Publishes shared file */
		void publishFile(const TTHValue& tth, int64_t size);
		
		/** Publishes partially downloaded file */
		void publishPartialFile(const TTHValue& tth);
		
		/** Set time when our sharelist should be republished */
		void setNextPublishing()
		{
			nextRepublishTime = GET_TICK() + REPUBLISH_TIME;
		}
		
		/** Is time when we should republish our sharelist? */
		bool isTimeForPublishing() const
		{
			return GET_TICK() >= nextRepublishTime;
		}
		
	private:
	
		/** Contains known hashes in the network and their sources */
		typedef unordered_map<TTHValue, SourceList> TTHMap;
		TTHMap tthList;
		
		/** Queue of files prepared for publishing */
		typedef std::deque<File> FileQueue;
		FileQueue publishQueue;
		
		/** Is publishing allowed? */
		bool publish;
		
		/** How many files is currently being published */
		atomic<long> publishing;
		
		/** Time when our sharelist should be republished */
		uint64_t nextRepublishTime;
		
		/** Synchronizes access to tthList */
		mutable CriticalSection cs;
		
		/** Add new source to tth list */
		void addSource(const TTHValue& tth, const Node::Ptr& node, uint64_t size, bool partial);
		
};

} // namespace dht

#endif  // _INDEXMANAGER_H